HeadacheHeadache DisordersMigraine DisordersPituitary ApoplexyHeadache Disorders, PrimaryTension-Type HeadacheCluster HeadacheSubarachnoid HemorrhageAbducens Nerve DiseasesIntracranial AneurysmVascular HeadachesAngiostrongylus cantonensisAneurysm, RupturedCerebral AngiographyHematoma, SubduralCranial SinusesNeurosurgical ProceduresTomography, X-Ray ComputedSinus Thrombosis, IntracranialDura MaterAnterior Cerebral ArteryHeadache Disorders, SecondaryNeck PainMagnetic Resonance ImagingNational Institutes of Health (U.S.)Cerebral HemorrhageFatal OutcomeEmbolization, TherapeuticTreatment OutcomeQuestionnairesMigraine without AuraSpinal PunctureMigraine with AuraBlood Patch, EpiduralNeurologyTrigeminal Autonomic CephalalgiasAnalgesicsTryptaminesSumatriptanIntracranial Hypotension